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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -17- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br />2) Runoff from the western fill area (i.e., Modules 1 through 6) will be directed <br />to the outboard ditch and discharged offsite via culverts previously noted <br />(see Finding 18 and Attachment B). <br /> <br />62. The Discharger may propose partial landfill closure upon reaching final elevations <br />on some, but not all modules. In such case, the Discharger will submit a partial <br />FCPMP(s) for the modules proposed for closure in accordance with Title 27 <br />requirements. <br /> <br />63. The PCP/PCMP includes a conceptual plan for the landfill cover consisting of GCL <br />in lieu of one foot of compacted clay for the LHC layer, an engineered alternative <br />to the prescriptive design under Title 27. The plan states that demonstration for <br />any such EAD proposal will be included in the Final Closure Plan when it is <br />submitted. Construction Specification D.10 requires that any such cover proposal <br />address the requirements of Title 27 and Subtitle D, including the requirement that <br />the cover not create a “bathtub effect”. <br /> <br />64. Landfill postclosure maintenance/monitoring activities will include final cover <br />maintenance; leachate management; maintenance and monitoring of LFG <br />facilities; groundwater, vadose zone, and surface water monitoring; maintenance <br />of precipitation and drainage controls; and other postclosure related activities. <br /> <br />FINANCIAL ASSURANCES <br />Closure <br />65. The Discharger is required to demonstrate financial assurances (F/As) for closure <br />to the California Integrated Waste Management Board (CIWMB) pursuant to Title <br />27, Section 22205, since the landfill operated after January 1, 1988. The total <br />estimated cost of closure provided in the PCP/PCMP after vertical expansion of <br />the landfill is $14,006,200 in 2008 dollars. The Discharger has established an <br />enterprise fund account (San Joaquin County Resolution No. R-90-1190) funded <br />from solid waste revenues as the mechanism for landfill closure F/A. <br /> <br />66. Section 22206 of Title 27 requires that the closure F/A demonstration be, at a <br />minimum, in the amount of the current closure cost estimate. The latter is the <br />minimum enterprise account funding balance required by the CIWMB under <br />Section 22225 of Title 27. The following table summarizes the status of closure <br />F/A provided to the CIWMB as of a September 2008 and F/A demonstration <br />parameters for vertical expansion of the landfill: <br />Parameter Closure F/A Demonstration <br /> Before Vertical <br />Expansion1 <br />After Vertical <br />Expansion2 <br />Landfill Capacity (yd3) 20,900,000 36,900,000